If you want to share model please perform these steps:
1. Click "My models"
2. Click on the model name you want to share
3. You'll get "Model details" screen
3. Click yellow button "Share model"
4. Add a person

"Sharing" screen shows you what you are currently sharing and invitations. 

This feature is on our roadmap. It will be deployed at the end of September.

Good point! Picking up guys will be easier than entering their emails. I hope you notice that there is email completion :)

We were thinking about 'teams', but decided to simplify company support at the begining. 

I said we don't have plan to support now but it fueled lively discussion here in the office :)  Let's keep this topic open. Please share your ideas/requirements here.